Glycerin

Glycerin

goodie
Also-called-like-this: Glycerol
Irritancy: 0
Comedogenicity: 0

Quick Facts

  • A natural moisturizer that’s also in our skin
  • Super common, used for more than 50 years
  • Not only a simple moisturizer but plays an important role in keeping the stuff between our skin cells healthy
  • High-glycerin moisturizers are awesome for treating severely dry skin

Geeky Details

Glycerin doesn’t sound very glamorous but it is a real oldie but a goodie. It’s been used in cosmetics for more than  50 years and it’s a totally natural ingredient that’s also in the outermost layer of our skin (called stratum corneum - SC). 

It’s a so-called humectant type of moisturiser meaning that it helps our skin to cling onto water. A 2005 study has shown that glycerin levels correlate with skin hydration levels, so more glycerin means better hydrated skin.

As newer studies examine glycerin it turns out more and more that it’s not just a simple humectant but also does some other important things: 

  •  It makes sure that the stuff between the skin cells is neither too diluted nor too concentrated (it’s called osmoregulation). 
  • It helps to maintain the healthy state of the cell membranes and intracellular lipids
  • It can normalize skin shedding in very dry skin. 

So what this all means is that glycerin is a real goodie and helps maintain the healthy state of our skin in several ways. 

And there is even more. If your skin is severely dry, you have to read this. A large-scale study done with 394 guys and girls with dry skin compared two high-glycerin (containing 25% and 40% glycerin) moisturizers to 16 other popular moisturizers on the market (that had less than 6% glycerin). The two high-glycerin ones won hands down. They had superior, quick-acting hydrating properties and they also seemed to create a “reservoir” of moisture-holding ability in the skin. This means that even after not using the high-glycerin moisturizer the skin stayed hydrated longer compared to all the other low glycerin moisturizers. 

You might think now that this is sooo awsome I will go to the pharmacy right now buy some glycerin and put it on my face. Well, do not do that. 100% pure glycerin is not good for the skin either. Too much glycerin (and in general humectants) might attract water out of the lower layers of the skin. That’s a problem because once water is in the upper layer some of it will evaporate. It’s called trans-epidermal-water-loss (TEWL). If too much TEWL happens your skin becomes dry. :( 

This is confirmed by a study too: skin treated to 99.7% glycerin for 5 days showed that after the treatment the SC (do you remember? it’s the outermost layer of the skin) was not visibly different from the untreated control. The same study also examined skin treated with a 25% glycerin lotion and there the SC had a visibly different, expanded - in other words more hydrated - appearance. 

So bottom line: glycerin is a real goodie and newer studies show that it might be more important for skin that we thought before. If your skin is very dry it’s a good idea to try out a high-glycerin (20-40%) moisturizer. 

Show me some proof

  • Leslie Baumann, MD, Cosmetic Dermatology, 2nd edition, Glycerin- pages 275
  • The Journal of investigative dermatology., 2005 Aug;125(2):288-93., Is endogenous glycerol a determinant of stratum corneum hydration in humans?
  • Dry Skin and Moisturizers: Chemistry and Function, Marie Loden, Howard I. Maibach, chapte 18: Glycerin: a natural ingredient for moisturizing dry skin

Products with Glycerin

Acure Incredibly Clear Cleansing Stick BOSCIA Charcoal Deep-Pore Cleansing Stick Treatment Belif The True Tincture Cleansing Stick Bioeffect 30 Day Treatment Bioeffect Egf Serum Caolion Blackhead Steam Pore Pack Dr. Jart+ Dermask Spot Jet Cheek & Eye Lift Ego Qv Intensive Moisturising Cleanser Erno Lazslo Hydra-Therapy Boost Serum Hanskin Hyaluron Skin Essence Holika Holika Good Cera Super Ceramide Moisture Balm I'm From Ginseng Mask L'oreal Smooth Sugar Clear Kiwi Face & Lip Scrub Lixir Vitamin C Paste Mario Badescu Peptide Renewal Serum Marvis Whitening Mint Toothpaste Meishoku Detclear Bright & Peel Hot Cleansing Gel Cream Missha Super Aqua Oil Clear Cleansing Foam MyChelle Dermaceuticals Gentle Cleansing Wash NIOD Copper Amino Isolate Serum 5% Neogen Real Fresh Green Tea Cleansing Stick Neutrogena Microdermabrasion Pads Omorovicza Silver Skin Saviour Peter Thomas Roth 24K Gold Mask Philosophy The Microdelivery Purifying Peel SU:M37 Miracle Rose Cleansing Stick Skinfood Egg White Pore Hot Steam Pack Soap & Glory Flake Away Body Polish TonyMoly Egg Pore Blackhead Steam Balm iS Clinical Warming Honey Cleanser oskia Renaissance Mask 100% Pure Fermented Rice Water Toner 2Sol Duna Moisture Pack 3LAB Anti-Aging Eye Lift 3LAB Perfect Balancing Toner A-Derma Xera-Mega Confort A. By Bom Ultra Time Return Eye Cream A.H.C Hydra B5 Soother A.H.C The First Diamond Ampoule Abib Relaxing Sleeping Pack Bright Tube Adsorb Antibody Moist Essence Serum Aesop Lucent Facial Concentrate African Botanics Cloudburst Micro-Emulsion Balancing Moisturizer Alba Botanica Even Advanced Deep Sea Facial Mask Allies of Skin 1A Overnight Mask Allies of Skin 1A™ All-Day Pollution Repair Mask Allies of Skin Bright Future Overnight Facial Allies of Skin Fresh Slate Purifying Cleanser + Masque Allies of Skin Molecular Multi-Nutrient Day Cream Alovivi Natto Toner